{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Checkpoint kinase 1 ( Chk1 ) inhibitors are being trialled for their efficacy in enhancing conventional chemotherapeutic agents , but their effectiveness as single agents is not known ."}
{"Chemical": []}